Here's what I believe, yes there is a God, and also his Son in which all good things were made and where all good things came from even before the creation of the world.
Also for those that never heard of Christ in this life, God being both just and merciful will let all of his children (human kind) have that oppurtunity.
Every good person from whatever creed or religion will have an oppurtunity to accept or reject Christ, either in this life or the next, it's all part of God's Plan of Salvation.
People that have heard of Christ in this life and rejected Christ here will not have another oppurtunity in the next life.
Here are the scriptures that explain that all humans have an inborn trait or spark letting them know there is a God or a part of God in them.
16 For behold, the Spirit of Christ is given to every man, that he may know good from evil; wherefore, I show unto you the way to judge; for every thing which inviteth to do good, and to persuade to believe in Christ, is sent forth by the power and gift of Christ; wherefore ye may know with a perfect knowledge it is of God.
17 But whatsoever thing persuadeth men to do evil, and believe not in Christ, and deny him, and serve not God, then ye may know with a perfect knowledge it is of the devil; for after this manner doth the devil work, for he persuadeth no man to do good, no, not one; neither do his angels; neither do they who subject themselves unto him.
18 And now, my brethren, seeing that ye know the light by which ye may judge, which light is the light of Christ, see that ye do not judge wrongfully; for with that same judgment which ye judge ye shall also be judged.